JPH0421606B2 - - Google Patents
Info
- Publication number
- JPH0421606B2 JPH0421606B2 JP5117486A JP5117486A JPH0421606B2 JP H0421606 B2 JPH0421606 B2 JP H0421606B2 JP 5117486 A JP5117486 A JP 5117486A JP 5117486 A JP5117486 A JP 5117486A JP H0421606 B2 JPH0421606 B2 JP H0421606B2
- Authority
- JP
- Japan
- Prior art keywords
- glass
- molding
- press
- glass material
- components
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000011521 glass Substances 0.000 claims description 45
- 238000000465 moulding Methods 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 26
- 239000011159 matrix material Substances 0.000 claims description 15
- 239000002344 surface layer Substances 0.000 claims description 13
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims 1
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims 1
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims 1
- 229910052796 boron Inorganic materials 0.000 claims 1
- 229910052810 boron oxide Inorganic materials 0.000 claims 1
- JKWMSGQKBLHBQQ-UHFFFAOYSA-N diboron trioxide Chemical compound O=BOB=O JKWMSGQKBLHBQQ-UHFFFAOYSA-N 0.000 claims 1
- 239000011133 lead Substances 0.000 claims 1
- 229910000464 lead oxide Inorganic materials 0.000 claims 1
- YEXPOXQUZXUXJW-UHFFFAOYSA-N oxolead Chemical compound [Pb]=O YEXPOXQUZXUXJW-UHFFFAOYSA-N 0.000 claims 1
- 229910052700 potassium Inorganic materials 0.000 claims 1
- 239000011591 potassium Substances 0.000 claims 1
- CHWRSCGUEQEHOH-UHFFFAOYSA-N potassium oxide Chemical compound [O-2].[K+].[K+] CHWRSCGUEQEHOH-UHFFFAOYSA-N 0.000 claims 1
- 229910001950 potassium oxide Inorganic materials 0.000 claims 1
- 229910052708 sodium Inorganic materials 0.000 claims 1
- 239000011734 sodium Substances 0.000 claims 1
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 claims 1
- 229910001948 sodium oxide Inorganic materials 0.000 claims 1
- 239000005304 optical glass Substances 0.000 description 23
- 238000000034 method Methods 0.000 description 11
- 238000004519 manufacturing process Methods 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 5
- 230000003746 surface roughness Effects 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000000682 scanning probe acoustic microscopy Methods 0.000 description 3
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000005355 lead glass Substances 0.000 description 1
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C23/00—Other surface treatment of glass not in the form of fibres or filaments
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B11/00—Pressing molten glass or performed glass reheated to equivalent low viscosity without blowing
- C03B11/06—Construction of plunger or mould
- C03B11/08—Construction of plunger or mould for making solid articles, e.g. lenses
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Re-Forming, After-Treatment, Cutting And Transporting Of Glass Products (AREA)
- Surface Treatment Of Glass (AREA)
Description
産業上の利用分野
本発明は主として高精度な光学ガラス素子（例
えばレンズ、プリズム等）をリヒートプレス成形
する際に用いる成形用ガラス素材に関するもので
ある。
従来の技術
近年、光学ガラスレンズは、光学機器のレンズ
構成の簡略化およびレンズ部分の軽量化を同時に
達成しうる非球面化の方向にある。この非球面レ
ンズを安価かつ多量に製造するためにダイレクト
プレス成形法（特公昭54−38126号公報）が検討
され、その中でリヒートプレス法が有望視されて
いる。（特開昭60−81032号公報）
発明が解決しようとする問題点
上記光学ガラス素子の製造において、光学ガラ
ス素子の光学性能は従来の研磨法による光学ガラ
ス素子のそれにくらべてより優れている必要があ
り、非常に高い面精度および面粗度が要求され
る。例えば、高精度カメラレンズの場合、面精度
ニユートンリング５本、アス１本以内、面粗さ
0.02μm以下であることが要求される。このよう
に高精度な光学ガラス素子を製造するための方法
として、リヒートプレス法が有力である。リヒー
トプレス法というのは、あらかじめ所望の光学ガ
ラス素子に近い形状に加工した光学ガラス素子を
加熱加圧成形して光学ガラス素子を製造する方法
である。光学ガラスにはB2O3やPbO等の蒸発し
やすい成分が含まれている。光学ガラス素子を加
熱するとガラス表面からこれらの成分が蒸発し
て、金型表面に蒸発成分が付着する。プレス成形
をくり返すに従つて、金型表面に付着物が推積し
て金型表面の精度が低下し、高精度な光学ガラス
素子を得ることが難しい。
問題点を解決するための手段
本発明は前記問題点を解決するために、高精度
な光学ガラス素子をリヒートプレス法で製造する
際に用いる、ガラス母体表面に易蒸発成分濃度が
ガラス母体より減少した表層部を設けた成形用ガ
ラス素材を提供するものである。
作 用
高精度な光学ガラス素子を成形するために、
種々のリヒートプレス法が検討されている。リヒ
ートプレス法においては、成形に用いる光学ガラ
ス素子の重量、形状、および表面状態が重要であ
る。従来表面状態で着目されていたのは、傷やく
ぼみなどの表面の微細な凹凸に関するものであつ
た。ガラス表面に微細な凹凸がないことは言うま
でもないが、光学ガラスにはB2O3やPbOなどの
易蒸発成分が含まれているため光学ガラス素子を
高温でプレス成形すると易蒸発成分が金型に付着
し、金型の形状精度および面粗度が変化する。こ
のような問題は本発明の成形用のガラス素材を用
いることによつて解決される。すなわち、本発明
の成形用ガラス素材は、ガラス母体表面にガラス
母体より易蒸発成分の少ない表層部を設けたこと
により、成形用ガラス素材を高温でプレス成形し
ても、金型表面に易蒸発成分が付着することを防
止する。金型表面に易蒸発成分の付着がないこと
により、多数回プレスした後においても、金型の
高精度な形状粗度と面粗度はほとんど変化しな
い。
実施例
以下、本発明の一実施例について述べる。
実施例 １
使用したガラスは、鉛ガラスSF−６であり、
ゴブ状のガラス素材を曲率半径が3.5mmおよび2.9
mm、コバ径が6.3mm、中心肉厚が８mmの両凸形状
に研削加工した。このガラス素材を25％フツ化水
素酸に５分間浸漬した後さらに第１表に示した条
件で硝酸に浸漬し、純水で洗浄後乾燥して図に示
した成形用ガラス素材を作製した。図において１
はガラス母体、２はガラス母体上に設けた表層部
である。成形用ガラス素材の表層部の厚みと鉛成
分の濃度分布をオージエ電子分光法（AES）で
測定した。第１表に示した条件で作製した成形用
ガラス素材各300個をプレス成形した。成形条件
は、金型温度510℃、プレス圧力20Kg／cm2、保持
時間１分間、窒素雰囲気中であつた。第１表に示
した条件で作製した成形用ガラス素材を各300個
プレス成形した後の金型表面およびフツ化マグネ
シウム（MgF2）をコーテイングした光学ガラス
素子表面を観察した。以上の結果を第１表に示し
た。
INDUSTRIAL APPLICATION FIELD The present invention mainly relates to a molding glass material used for reheat press molding of high-precision optical glass elements (for example, lenses, prisms, etc.). BACKGROUND OF THE INVENTION In recent years, optical glass lenses have been trending toward aspheric surfaces that can simultaneously simplify the lens structure of optical instruments and reduce the weight of the lens portion. Direct press molding methods (Japanese Patent Publication No. 54-38126) have been studied in order to manufacture these aspherical lenses in large quantities at low cost, and among these methods, the reheat press method is considered to be promising. (Japanese Unexamined Patent Publication No. 60-81032) Problems to be Solved by the Invention In manufacturing the above-mentioned optical glass element, the optical performance of the optical glass element must be superior to that of the optical glass element produced by the conventional polishing method. Therefore, extremely high surface accuracy and surface roughness are required. For example, in the case of a high-precision camera lens, the surface accuracy should be 5 Newton rings, 1 or less, and surface roughness.
It is required that it is 0.02 μm or less. As a method for manufacturing such a highly precise optical glass element, the reheat press method is effective. The reheat press method is a method of manufacturing an optical glass element by heating and press-molding an optical glass element that has been previously processed into a shape close to a desired optical glass element. Optical glass contains components that easily evaporate, such as B 2 O 3 and PbO. When the optical glass element is heated, these components evaporate from the glass surface, and the evaporated components adhere to the mold surface. As press molding is repeated, deposits accumulate on the mold surface, reducing the precision of the mold surface, making it difficult to obtain a highly precise optical glass element. Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a method in which the concentration of easily evaporated components on the surface of the glass matrix is lower than that of the glass matrix, which is used when manufacturing high-precision optical glass elements by the reheat press method. The present invention provides a molding glass material provided with a surface layer portion having a surface layer. Function In order to form high-precision optical glass elements,
Various reheat pressing methods have been studied. In the reheat press method, the weight, shape, and surface condition of the optical glass element used for molding are important. Conventionally, the focus of attention on surface conditions has been on minute irregularities on the surface such as scratches and depressions. It goes without saying that there are no minute irregularities on the glass surface, but since optical glass contains easily evaporable components such as B 2 O 3 and PbO, when an optical glass element is press-molded at high temperatures, the easily evaporable components are released into the mold. The shape accuracy and surface roughness of the mold change. Such problems can be solved by using the glass material for molding of the present invention. In other words, the glass material for molding of the present invention has a surface layer on the surface of the glass matrix that has less easily evaporated components than the glass matrix, so even if the glass material for molding is press-molded at a high temperature, there is no easily evaporated component on the mold surface. Prevents components from adhering. Since there is no easily evaporated component attached to the mold surface, the highly accurate shape roughness and surface roughness of the mold hardly change even after pressing many times. Embodiment An embodiment of the present invention will be described below. Example 1 The glass used was lead glass SF-6,
Gob-shaped glass material with curvature radius of 3.5 mm and 2.9
It was ground into a biconvex shape with an edge diameter of 6.3 mm and a center wall thickness of 8 mm. This glass material was immersed in 25% hydrofluoric acid for 5 minutes, then further immersed in nitric acid under the conditions shown in Table 1, washed with pure water and dried to produce the glass material for molding shown in the figure. In the figure 1
2 is a glass matrix, and 2 is a surface layer provided on the glass matrix. The thickness of the surface layer of the glass material for molding and the concentration distribution of lead components were measured using Auger electron spectroscopy (AES). Each of 300 glass materials for molding produced under the conditions shown in Table 1 was press-molded. The molding conditions were a mold temperature of 510° C., a press pressure of 20 Kg/cm 2 , a holding time of 1 minute, and a nitrogen atmosphere. After press-molding 300 molding glass materials produced under the conditions shown in Table 1, the mold surface and the surface of an optical glass element coated with magnesium fluoride (MgF 2 ) were observed. The above results are shown in Table 1.
【表】
第１表から明らかなように、本発明の成形用ガ
ラス素材を用いてプレス成形した光学ガラス素子
は非常に良好な光学特性を有していた。また、
300回プレス成形した後の金型表面に蒸発成分の
Pbの付着はなかつた。これに対して比較例とし
て示した成形用ガラス素材をプレス成形した場
合、MgF2のコーテイング膜がはくりしたり、極
くわずかに凹凸した部分があり、本発明の成形用
ガラス素材をプレス成形したものより劣つてい
た。
実施例 ２
使用したガラスは、実施例−１と同様の材質お
よび形状のものであり、このガラス素材を赤外線
集中加熱法により熱処理した。熱処理条件は、
700℃、10秒間であつた。このようにして作製し
た成形用ガラス素材の表層部の厚みは600Åであ
り、ガラス母体と表層部とのPb濃度比は0.3であ
ることががオージエ電子分光法で確認された。こ
の成形用ガラス素材を実施例−１と同様の条件で
300回プレス成形した。プレス成形後、MgF2を
コーテイングして光学ガラス素子の光学性能を評
価した。その結果、光学ガラス素子にMgF2のコ
ーテイング膜のはくりや微細な凹凸もなく、非常
に良好な光学特性を有していた。またプレス成形
後の金型表面に蒸発成分のPbの付着はなかつた。
なお本発明は図に示した形状に限定されるもので
はなく、その他の形状の光学ガラス素子にも適用
できることは言うまでもない。
発明の効果
以上の説明から明らかなように、本発明の成形
用ガラス素材は、ガラス母体表面に易蒸発成分濃
度がガラス母体より減少した表層部を設けたこと
を特徴とするものである。本発明の成形用ガラス
素材は、ガラス母体上にガラス母体より易蒸発成
分の少ない表層部を設けたことにより、成形用ガ
ラス素材をプレス成形しても、金型表面に易蒸発
成分の付着が防止される。金型表面に易蒸発成分
の付着がないことにより、多数回プレス成形した
後においても、金型の高精度な形状精度と面粗度
はほとんど変化していなかつた。
したがつて、本発明の成形用ガラス素材によ
り、非常に容易にかつ安価に高精度な光学ガラス
素子の製造が可能となり、本発明の工業的価値は
極めて大なるものがある。[Table] As is clear from Table 1, the optical glass element press-molded using the molding glass material of the present invention had very good optical properties. Also,
After 300 press moldings, the surface of the mold shows evaporated components.
There was no Pb adhesion. On the other hand, when the molding glass material shown as a comparative example was press-molded, the MgF 2 coating film peeled off and there were very slight uneven parts. It was inferior to what was done. Example 2 The glass used had the same material and shape as in Example-1, and this glass material was heat-treated by an infrared concentrated heating method. The heat treatment conditions are
The temperature was 700°C for 10 seconds. It was confirmed by Auger electron spectroscopy that the thickness of the surface layer of the glass material for molding thus produced was 600 Å, and the Pb concentration ratio between the glass matrix and the surface layer was 0.3. This glass material for molding was processed under the same conditions as in Example-1.
Press molded 300 times. After press molding, the optical performance of the optical glass element was evaluated by coating it with MgF 2 . As a result, the optical glass element had very good optical properties, with no peeling of the MgF 2 coating film or minute irregularities. Furthermore, there was no Pb, an evaporated component, attached to the mold surface after press molding.
It goes without saying that the present invention is not limited to the shape shown in the figures, but can be applied to optical glass elements of other shapes. Effects of the Invention As is clear from the above description, the glass material for molding of the present invention is characterized by providing a surface layer portion on the surface of the glass matrix in which the concentration of easily evaporable components is lower than that of the glass matrix. The glass material for molding of the present invention has a surface layer on the glass matrix that contains fewer easily evaporable components than the glass matrix, so even when the glass material for molding is press-molded, the easily evaporable components do not adhere to the mold surface. Prevented. Since there was no adhesion of easily evaporated components to the mold surface, the highly accurate shape accuracy and surface roughness of the mold remained almost unchanged even after press molding was performed many times. Therefore, the glass material for molding of the present invention makes it possible to manufacture highly accurate optical glass elements very easily and inexpensively, and the industrial value of the present invention is extremely great.
図は本発明の一実施例における成形用ガラス素
材の断面図である。
１……ガラス母体、２……表層部。
The figure is a sectional view of a glass material for molding according to an embodiment of the present invention. 1... Glass matrix, 2... Surface layer part.
Claims (1)
体より減少した表層部を設けたことを特徴とする
成形用ガラス素材。 ２ 表層部の厚みが、1000Å以下であることを特
徴とする特許請求の範囲第１項記載の成形用ガラ
ス素材。 ３ 表層部の易蒸発成分濃度が、ガラス母体の易
蒸発成分濃度の0.01倍から0.9倍の範囲内である
ことを特徴とする特許請求の範囲第１項または第
２項のいずれかに記載の成形用ガラス素材。 ４ 易蒸発成分が、ホウ素、鉛、ナトリウム、カ
リウム、酸化ホウ素、酸化鉛、酸化ナトリウム、
および酸化カリウムであることを特徴とする特許
請求の範囲第１項、第２項、または第３項のいず
れかに記載の成形用ガラス素材。[Scope of Claims] 1. A glass material for molding, characterized in that a surface layer portion having a lower concentration of easily evaporable components than the glass matrix is provided on the surface of the glass matrix. 2. The glass material for molding according to claim 1, wherein the thickness of the surface layer portion is 1000 Å or less. 3. The glass according to claim 1 or 2, wherein the concentration of easily evaporable components in the surface layer portion is within a range of 0.01 to 0.9 times the concentration of easily evaporated components in the glass matrix. Glass material for molding. 4 Easily evaporated components include boron, lead, sodium, potassium, boron oxide, lead oxide, sodium oxide,
and potassium oxide, the glass material for molding according to any one of claims 1, 2, and 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5117486A JPS62207728A (en) | 1986-03-07 | 1986-03-07 | Glass material for molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5117486A JPS62207728A (en) | 1986-03-07 | 1986-03-07 | Glass material for molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62207728A JPS62207728A (en) | 1987-09-12 |
| JPH0421606B2 true JPH0421606B2 (en) | 1992-04-13 |
Family
ID=12879469
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5117486A Granted JPS62207728A (en) | 1986-03-07 | 1986-03-07 | Glass material for molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62207728A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2739916B2 (en) * | 1992-02-18 | 1998-04-15 | キヤノン株式会社 | Glass blank for manufacturing optical element and method for manufacturing optical element using the same |
| JP2002012436A (en) * | 2000-06-23 | 2002-01-15 | Nippon Sheet Glass Co Ltd | Method of treating glass plate end and plate glass treated thereby |
| JP2010006621A (en) * | 2008-06-24 | 2010-01-14 | Olympus Corp | Molding stock for optical element and method for producing the same |
| JP2011027993A (en) | 2009-07-24 | 2011-02-10 | Panasonic Corp | Optical component and method for producing the same |
| JP2011027992A (en) | 2009-07-24 | 2011-02-10 | Panasonic Corp | Optical component and method for producing the same |
| EP3519366B1 (en) | 2016-09-29 | 2022-10-19 | Corning Incorporated | Compositional modification of glass articles through laser heating and methods for making the same |
-
1986
- 1986-03-07 JP JP5117486A patent/JPS62207728A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62207728A (en) | 1987-09-12 |
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